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Transmission enhancement of subwavelength grating microlens by tapered nanostructure

Published online by Cambridge University Press:  23 April 2018

Mao Ye Open the ORCID record for Mao Ye [Opens in a new window] ,
Xiaopeng Guo  and
Yasha Yi
Mao Ye
Affiliation:
Integrated Nano Optoelectronics Laboratory, University of Michigan, 4901 Evergreen Road, Dearborn, Michigan 48128, USA
Xiaopeng Guo
Affiliation:
Integrated Nano Optoelectronics Laboratory, University of Michigan, 4901 Evergreen Road, Dearborn, Michigan 48128, USA
Yasha Yi*
Affiliation:
Integrated Nano Optoelectronics Laboratory, University of Michigan, 4901 Evergreen Road, Dearborn, Michigan 48128, USA Energy Institute, University of Michigan, 2301 Bonisteel Blvd., Ann Arbor, Michigan 48109, USA
*
Address all correspondence to Yasha Yi at [email protected]
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Abstract

The emerging planar subwavelength microlens has attracted wide attention recently. There exists a trade-off in the selection of phase shifter materials for the lens designed with linearly polarized incidence. In this work, we have discovered that it is possible to utilize tapered nanostructure to increase the transmission of phase shifters built with high refractive index materials. A typical grating microlens is demonstrated to examine the effectiveness of taper-enhancement effect—the focus efficiency is increased from 9% to 28% with the properly designed tapered sidewall. Our work will provide a novel method to enhance performance using high refractive index materials in the emerging microlens field.

Type
Research Letters
Information
MRS Communications , Volume 8 , Issue 2 , June 2018 , pp. 509 - 513
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Copyright
Copyright © Materials Research Society 2018 

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